L. S. Castro and A. G. Silva Júnior, “Volatility analysis of sunflower oil prices in Brazil from 1960 to 2011”, Rev. Polit. Agric., vol. 22, no. 2, pp. 76–84, Jul. 2013, Accessed: Sep. 20, 2026. Available: https://rpa.sede.embrapa.br/RPA/article/view/309